CVE-2021-23336

Monday, February 15, 2021

5.9

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H/E:P/RL:U/RC:C

Summary

The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.

Affected Software

Vendor	Product	Version Range	Status
n/a	python/cpython	`0 < unspecified`	affected
n/a	python/cpython	`unspecified < 3.6.13`	affected
n/a	python/cpython	`3.7.0 < unspecified`	affected
n/a	python/cpython	`unspecified < 3.7.10`	affected
n/a	python/cpython	`3.8.0 < unspecified`	affected
n/a	python/cpython	`unspecified < 3.8.8`	affected
n/a	python/cpython	`3.9.0 < unspecified`	affected
n/a	python/cpython	`unspecified < 3.9.2`	affected

Weaknesses

Web Cache Poisoning

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

SSVC:
Exploitation: none
- Automatable: no
- Technical Impact: partial

References

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